Bridge rectifiers revisited:

HIGH-EFFICIENCY AC-OC CONVERTER/VOLTAGE MULTIPLIER

This article discusses an extension of the well-known
single-phase, full-wave bridge rectifier to provide a high-efficiency
voltage multiplier. The extension is based on a circuit developed by
Dip.Eng. Th. Gisper, a Swiss engineer, who described his design in
a paper entitled HF-DC-Converter-Schaltung in der passiven
Telemetrie (Eidgenössische Technische Hochschule-ETHZürich
26 February 1988).